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#include <lldb/API/LLDB.h>
#include <iostream>
#include <string>
#include <thread>
#include <chrono>
#include <fstream>
#include <vector>
using namespace lldb;
void print_variables(SBFrame &frame) {
SBValueList vars = frame.GetVariables(true, true, false, true);
for (uint32_t i = 0; i < vars.GetSize(); ++i) {
SBValue var = vars.GetValueAtIndex(i);
std::cout << var.GetName() << " = ";
if (!var.IsValid()) {
std::cout << "(invalid)\n";
}
else if (var.GetType().IsPointerType()) {
uint64_t addr = var.GetValueAsUnsigned();
if (addr == 0) {
std::cout << "(null pointer)\n";
} else {
std::cout << "(pointer at 0x" << std::hex << addr << std::dec << ")\n";
}
}
else if (var.GetNumChildren() > 0) {
std::cout << "{ ";
uint32_t n = var.GetNumChildren();
for (uint32_t j = 0; j < n; ++j) {
SBValue child = var.GetChildAtIndex(j);
std::cout << child.GetName() << ": " << (child.IsValid() ? child.GetValue() : "(invalid)");
if (j + 1 < n) std::cout << ", ";
}
std::cout << " }\n";
} else {
std::cout << var.GetValue() << "\n";
}
}
}
void print_backtrace(SBThread &thread) {
int num_frames = thread.GetNumFrames();
for (int i = 0; i < num_frames; ++i) {
SBFrame frame = thread.GetFrameAtIndex(i);
std::cout << "#" << i << " " << frame.GetFunctionName()
<< " at line " << frame.GetLineEntry().GetLine() << "\n";
}
}
void print_source_line(const std::string& filepath, int line_number) {
std::ifstream file(filepath);
if (!file.is_open()) {
// std::cerr << "Could not open source file: " << filepath << "\n";
return;
}
std::string line;
int current_line = 1;
while (std::getline(file, line)) {
if (current_line >= line_number - 3 && current_line <= line_number + 3) {
std::cout << (current_line == line_number ? " -> " : " ")
<< current_line << ": " << line << "\n";
}
if (current_line > line_number + 3) break;
current_line++;
}
}
int main(int argc, char** argv) {
if (argc < 2) {
std::cerr << "Usage: " << argv[0] << " <target_executable>\n";
return 1;
}
const char* target_path = argv[1];
// Initialize LLDB.
SBDebugger::Initialize();
SBDebugger debugger = SBDebugger::Create();
debugger.SetAsync(true);
SBTarget target = debugger.CreateTarget(target_path);
if (!target.IsValid()) {
std::cerr << "Failed to create target for " << target_path << "\n";
return 1;
}
SBBreakpoint bp = target.BreakpointCreateByName("main");
std::cout << "Breakpoint set at main\n";
SBProcess process = target.LaunchSimple(nullptr, nullptr, ".");
if (!process.IsValid()) {
std::cerr << "Failed to launch process\n";
return 1;
}
std::cout << "Process launched\n";
SBListener listener = debugger.GetListener();
SBEvent event;
std::string last_cmd;
while (true) {
// Wait for events from LLDB.
if (listener.WaitForEvent(1, event)) {
StateType state = SBProcess::GetStateFromEvent(event);
switch (state) {
case eStateStopped:
{
std::cout << "\nProcess stopped!\n";
SBThread thread = process.GetSelectedThread();
SBFrame frame = thread.GetFrameAtIndex(0);
std::cout << "Stopped at function: " << frame.GetFunctionName()
<< ", line: " << frame.GetLineEntry().GetLine() << "\n";
SBFileSpec line_entry = frame.GetLineEntry().GetFileSpec();
if (line_entry.IsValid()) {
// Directory and Filename might be null if not debug info
const char* dirname = line_entry.GetDirectory();
const char* filename = line_entry.GetFilename();
if (filename) {
std::string fullpath;
if (dirname) {
fullpath = std::string(dirname) + "/" + std::string(filename);
} else {
fullpath = std::string(filename);
}
print_source_line(fullpath, frame.GetLineEntry().GetLine());
}
}
// REPL loop for user commands.
std::string cmd;
while (true) {
std::cout << "(tdbg) ";
std::getline(std::cin, cmd);
if (cmd.empty()) {
if (last_cmd.empty()) {
continue;
}
cmd = last_cmd;
} else {
last_cmd = cmd;
}
if (cmd == "c") {
process.Continue();
break; // exit REPL, wait for next stop
} else if (cmd == "s") {
thread.StepInto();
break;
} else if (cmd == "n") {
thread.StepOver();
break;
} else if (cmd == "bt") {
print_backtrace(thread);
} else if (cmd == "v") {
print_variables(frame);
} else if (cmd == "h") {
std::cout << "Commands: c=continue, s=step in, n=step over, bt=backtrace, v=variables, q=quit, h=help\n";
} else if (cmd == "q") {
process.Kill();
goto cleanup;
} else {
std::cout << "Unknown command. Type 'h' for help.\n";
}
}
break;
}
case eStateExited:
{
std::cout << "Process exited\n";
goto cleanup;
}
case eStateRunning:
break;
default:
break;
}
} else {
std::this_thread::sleep_for(std::chrono::milliseconds(50));
}
}
cleanup:
SBDebugger::Terminate();
return 0;
}
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